About This Gigapan

This set of images was shot at f8 at 1/500 second. This info that I gain from my editing software is different than the stitcher-note info.
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www.gigapan.org/viewGigapan.php?id=8215 was shot at f8 at 1/320 second. Observe the detail difference in that snapshot as compared to this pano.
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Note: Wortham Fountain was shot at f8 at 1/250 second.